Metal spray attachment



9 1951 E. B. SAUPE METAL SPRAY ATTACHMENT Filed Nov. 12, 1947 Patented Aug. 7, 1951 METAL SPRAY ATTACHMENT Edward B. Saupe, Red Wing, Minn.; Hazel E. Saupe, administratrix of said Edward B. Saupe,

deceased Application November 12, 194 Serial No. 785,361

The present invention relates to a device for projecting metal in a molten form and is adaptedto bemounted on a conventional type burner which is often referred to as a blow torch. The invention more specifically pertains to the structural features. of the metal spraying device which may be attached to a conventional burner or torch without altering the heating appliance.

1 It is an object of the invention-to provide a tubular assembly for storing metal adjacent the burner of a conventional type blow torch sothat the metal may be rendered molten and projectedxin a fluid and atomized state onto a surface or article to be coated with. metal.

A more specific object. of the invention resides. in the provision of a chamber above the burner of a. blow torch for receiving metal having-a relatively low melting point so that the: metalmay beheated to a molten state and projected onto a surface or article which is. to be sprayed with metal. i

A more detailed object of. the invention resides in-the provision. of one or more baffles within the metal. storing and melting chamber so as to tacilitate. feeding of the metal to the projecting nozzle. 7

Other objects and features of the invention will be more apparent as the present disclosure proceeds and upon consideration of the accompanying drawing and the following detailed de scription wherein an exemplary embodiment of the invention is disclosed.

i In the drawing:

Fig. 1 is a side elevational view of a metal spray attachment embodying the invention mounted on conventional burner or blow torch.

Fig. 2 is a plan view of the apparatus shown in Fig. 1.

' Fig. 3 is a longitudinal sectional view of the metal. spraying attachment taken on the line 3-3 of Fig. 2.

Fig. 4 is. a transverse view of the metal storing and heating chamber taken on the line 4--4 of Fig. 3.

, The invention is directed to an attachment for spraying lead or other low melting point metalsonto various articles such as in repairing radiators of motor vehicles without removing the radiator and for projecting solder or other low melting point alloys into places which are relativcly inaccessible. The attachment is designed primarily for repair service work and is adapted to be mounted on a burner of any suitable type and preferably one which is known generally as a blow torch.

3v Claims. (Cl. ill-42.2.)

Referring to the drawing, a burner is illustrated at HT which is adapted to project a flame or. heat at a relatively high temperature from the open ing in the forward end H thereof. This burner is of a. well known type and is. adapted to be supplied with liquid fuel from a tank l2. The tank 12 i's alsc supplied with air pressure created by a pumpof a well known type and the manually operable handle thereof isindicated at M. The supply of fuel. to the. burner ID is controlled by means of a valve Iii which may be controlled by means of a hand wheel ll. The burner and the iuel supply chamber form a unit which may be held in suitable position by means of. a handle is. The burner assembly hereinabove described represents one of conventional type often reterred to as a blow torch.

The flame or. burned products of combustion; issuing from the forward end ll of the. burner H1 after being inoperationfor a few minutes pro-- vides. a relatively high temperature source of heatwhich is. projected for a distance of several inches from the forward end of the burner it). In carrying out the invention the metal spraying attachmentv is mounted above the burner and forwardly of the end ll. of the burner Ill. Accordingly, the high temperature area. immediately therebelow serves to heat the metal spraying attachment. This device includes a tubular member 20' having a relatively large diameter rear portion 2! and a smaller diameter forward portion 22 integrally joined by an inclined or frustoconical portion 26.. The tubular member is hollow and is closed at its rear end by means of a disc 21 threaded into the tubular member 20 at 25. The forward end of the tubular portion 22 is provided with an opening or aperture 28 as shownin Fig. 3.

A tube 31' is arranged to extend throughout the length of the tubular member 20' and the tube 3| is arranged concentric with the axis of the tubular member. This tube 31- is of a uniform diameter throughout its length and is joined to the forward end of the tubuiar portion 22 in a sealed manner. The tube 3t may be welded or otherwise connected to the forward endflange 33 of the tubular member 20. The tube 31 may be formed integral with the disc 21 to provide a passage therethrough as shown in Fig. 3;

The attachment includes provision for the supply of air or other gasunder pressure to the tube 3|. It is for this purpose that a short sec tion of pipe 36 is connected to the tube 3|. In the embodiment illustrated the pipe section 36 is threaded into a projection 31 formed on the disc 21. This projection 3'! is preferably provided with fiat faces to form a hexagonal nut for the application of a suitable tool or wrench for threading the tubular assembly 20 onto the nipple 36. An elbow 38 is threaded onto the nipple 36 and this elbow is connected to another short section of pipe indicated at 4!. Thereafter elbow and pipe connections provide a conduit extending downwardly and along the side of the blow torch. This conduit assembly is provided with a valve 44 for controlling the supply of compressed air to the tube 3].

The metal spraying attachment is securely maintained in an operative position relative to the burner IS in any suitable manner such as by means of a U-shaped strap 51 which partly embraces the burner Ill with the legs of the strap extending upwardly as shown in Figs. 1 and 2. The pipe section 4! extends through a leg 53 and the strap is maintained in firm gripping relationship on the burner by means of a bolt 54 which extends through the free ends of the legs of the U-shaped strap. The pipe M, the nipple 36 and elbow 38 provide a relatively rigid conduit whereby the tubular member 20 is maintained in fixed association with the blow torch. The conduit for the air may also be attached to the handle I?! by means of a bracket 51' which embraces the pipe 60 near the valve 44. This bracket is clamped to the pipe 66 and the upper arm of the handle I8 by a plurality of bolts 55. A threaded nipple 58 is provided on the pipe 68 for connection to a source of air or other gaseous medium under pressure.

The tubular member 20 and the enlarged portion 2! thereof is provided with an opening 6| in the upper rear part for the introduction of lead, alloys thereof, or any other metal preferably of a low melting point type. This metal is heated by the heat issuing from the forward end ll of the burner Ill so that the metal is rendered molten in the tubular member and is accommodated in the space 62. Thereafter compressed air may be supplied to the pipe 3| by opening the valve 44. through the tube 3| and escapes through the opening 28 so as to form a relatively high velocity air jet. The tube 31 is provided with an opening 66 in the forward end portion thereof shown in Fig. 3. The air moving through the nozzle 28 creates a low pressure condition in the opening 66 so as to draw molten metal from the chamber 62 and from the annular passage 61. The molten metal is thereby carried forward by the air jet for projection onto the article which is to receive the metal spray.

A feature of the invention pertains to the provision of one or more baffles 68 within the tubular member 20. These baflles may be annular shaped and secured to the inner wall of the larger tubular portion 2|. The baifles 68 are each provided with a relatively large central opening II through which the molten metal may move into the annular space 61. The baffles serve the purpose of retaining the metal within the chamber 62 and thereby in a position to receive an efficient transfer of heat from the burner ll]. Accordingly, the temperature of the metal is raised to the melting point and above before any material amount is permitted to move through the openings H and into the annular passage 61. This This air under pressure moves .4 bafile arrangement, therefore, provides a relatively large reservoir of metal at a temperature somewhat above the molten melting point so as to maintain its fluid condition in passing through the annular chamber 6'! and through the opening 66.

While the invention has been described with regard to specific structural details it will be appreciated that a number of changes may be made in the shape of the various parts and in the mounting of the attachment on a burner. Such modifications and others may be made without departing from the spirit and scope of the invention as set forth in the appended claims.

I claim:

1. A metal spray attachment for burner com prising, a tubular member having an enlarged rear portion and a smaller diameter forward portion, means for supporting said tubular member above and forwardly of the burner, said enlarged portion of the tubular member having a hole therein for the introduction of metal, a tube extending through the large and smaller portions of the tubular member, said tube having an opening therein communicating with the interior of the tubular member, and a baffle positioned within the enlarged portion of the tubular member extending between the wall thereof and said tube for restricting the flow of molten metal towards that opening and for conducting heat to said metal.

2. A metal spray attachment for burner comprising, a tubular member having an enlarged rear portion and a smaller diameter forward portion. a U-shaped member for supporting said tubular member above and forwardly of the burner, said enlarged portion of the tubular member having a hole therein for the introduction of metal, a tube extending through the large and smaller portions of the tubular member, means for supplying compressed air to said tube, said tube having an opening therein communicating with the interior of the tubular member, and bafile means positioned within the enlarged portion of the tubular member and extending inwardly from the wall of said member.

3. A metal spray attachment for burner comprising, a tubular member having an enlarged rear portion and a smaller diameter forward portion, means for supporting said tubular member above and forwardly of the burner, said enlarged portion of the tubular member having a hole in the upper portion thereof for the introduction of metal, a tube concentric with the tubular member extending through the enlarged and small portions of the tubular member, said tube having an opening in the lower forward end thereof communicating with the interior of the tubular member, and baflle means positioned 1igrithin the enlarged portion of the tubular mem- EDWARD B. SAUPE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,143,232 Taylor Jan. 10, 1939 2,225,168 Forton Dec. 17, 1940 2,252,942 Mourer Aug. 19, 1941 

